Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
cac nuoc » cap nuoc, hoc nuoc, cua nuoc
van hanh » van thanh, ban hanh, van anh
hanh han » hanh nhan, hanh phan, hanh san
su sach » so sach, vu sach
nang co » nang cao, nang doc, nang noi
han cua » hang cua, nhan cua, than cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang co hoi. hieu hien ((cac nuoc) or (dat nuoc)) van hanh han cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang co hoi. hieu hien ((cac nuoc) OR (dat nuoc)) van hanh han cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang co hoi. hieu hien ((cac nuoc) or (dat nuoc)) van hanh han cua tre*.